Update. I did post this thread as some kind of bragging about DeSmuME's wifi capabilities (mostly worked on by me ). But it appears that we got noticed at Nintendo's side and they took a first measure to block us. Of course, this is bad. Because of this, WFC will now stay blocked until we get "perfect" enough to not get noticed again at Nintendo's side. DO NOT ask why WFC doesn't work. Now you know. Edit- if you wish to test DeSmuME's wifi capabilities without using WFC, you can still give the DS browser a try, and there's also a lot of dswifi homebrews that should work.